If you make the dog breath only freon it will kill it form lack of oxygen. If the unit has a leak it will not be high enough concentration to kill the dog.
yes
You can find a Freon leak in a home Ac unit by using a leak detector. These instruments are capable of detecting trace amounts of Freon and pinpoint leaks.
16
How old is the tempstar.
Yes. It can be recycled and reused.
4 pounds
Well, if the unit was originally meant to be recharged with the old freon, a kit is needed to allow recharge with the new.
The proper term is actually refrigerant - Freon is a specific brand name trademarked by DuPont for a series of CFC and HFC refrigerants - thus, an AC system only has Freon if it has the product manufactured by DuPont. Answering your question, yes, an outside AC unit uses refrigerant, although it's normally not the same type used in automotive AC systems.
It is possible low on freon.
R-22
It a word, no. Without a leak, the freon level in your unit should stay the same for years and years.
Freon may need to be added when the ac is not blowing cold enough. A Freon gauge can tell you for sure if the pressure is low.